IDN - Need help

[Per olof Ljungmark]

On 6/18/2017 2:07 PM, Walter H. via Info-cyrus wrote:
> On 18.06.2017 14:00, Per olof Ljungmark wrote:
>> I am re-posting this - would really like some help here. We need Cyrus
>> to accept mail with international characters in sender address. If
>> someone have experience please share, thanks!
>>
>> This is what Postfix reports when it tries to deliver to Cyrus:
>>
>> (SMTPUTF8 is required, but was not offered by host XXX
>> [/var/imap/socket/lmtp])
>>
>> (can't see anything relevant in the log from Cyrus)
>>
>> We want it to be delivered but I cannot figure out how - the sender
>> address has a "ü" in it.
>>
>> Really grateful for a hint.
>>
>> Thanks,
> IDN domains are internally like
> 
> xn--.....
> 
> see here ...
> https://www.verisign.com/en_US/channel-resources/domain-registry-products/idn/idn-conversion-tool/index.xhtml
> 
> 
> and I don't see a reason why not accepting    xn--toxh-47747djia.com
> 
Yes, I know about the format, what I do not understand is how it is
supposed to be implemented.

Postfix is delivering via lmtp as "ü", not converted to Punycode. Are
you saying that it should arrive to our mx's already converted? The
sender in question uses a @gmail address.